Emphasized TI
Character Set
The custom character set given for the Commodore 64 on pages 108-109 of
COMPUTE!'S January 1986 issue can be used on the TI-99/4A with only
slight modifications. Since that character definition data is listed in
hexadecimal format, it can be read as a pattern-identifier string and
assigned with the CALL CHAR statement (see page II-76 in the TI User's Reference Guide). Each
line in the Commodore character set listing contains data for a single
character plus a checksum value at the end of the line. To convert the
data in each line to a 16-character pattern-identifier string, type in
the first eight two-digit hexadecimal numbers (spaces are left out, of
course). In the first line, for instance, the resulting string could be
used with a CALL CHAR statement to redefine the @ character. To create
the new character set, first enter this program:

Next, you must enter a series of lines containing
DATA statements. Each DATA statement represents the data for one
character in the form of a 16-character pattern identifier string. For
example, the first DATA line would look like this: